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Summary of Marketable Securities (Parenthetical) (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Obligations for which assets are held in trust | $ 127,800,000 us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent |  | $ 127,800,000 us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent |  | $ 117,600,000 us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent
Recognized investment (loss) income | $ (200,000)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments | $ 1,200,000 us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments | $ 4,328,000 us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments | $ 7,578,000 us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements other than those specified elsewhere in the taxonomy. + References No definition available. + Details
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